/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.db.wal.buffer;

import org.apache.iotdb.db.conf.IoTDBConfig;
import org.apache.iotdb.db.conf.IoTDBDescriptor;
import org.apache.iotdb.db.mpp.plan.planner.plan.node.write.InsertTabletNode;
import org.apache.iotdb.db.wal.utils.WALMode;

/**
 * This entry class stores info for persistence
 */
public class WALInfoEntry extends WALEntry {
    private static final IoTDBConfig config = IoTDBDescriptor.getInstance().getConfig();

    /**
     * wal entry type 1 byte, memTable id 8 bytes
     */
    public static final int FIXED_SERIALIZED_SIZE = Byte.BYTES + Long.BYTES;

    /**
     * extra info for InsertTablet type value
     */
    private TabletInfo tabletInfo;

    public WALInfoEntry(long memTableId, WALEntryValue value, boolean wait) {
        super(memTableId, value, wait);
    }

    public WALInfoEntry(long memTableId, WALEntryValue value) {
        this(memTableId, value, config.getWalMode() == WALMode.SYNC);
        if (value instanceof InsertTabletNode) {
            tabletInfo = new TabletInfo(0, ((InsertTabletNode) value).getRowCount());
        }
    }

    public WALInfoEntry(long memTableId, InsertTabletNode value, int tabletStart, int tabletEnd) {
        this(memTableId, value, config.getWalMode() == WALMode.SYNC);
        tabletInfo = new TabletInfo(tabletStart, tabletEnd);
    }

    WALInfoEntry(WALEntryType type, long memTableId, WALEntryValue value) {
        super(type, memTableId, value, false);
    }

    @Override
    public int serializedSize() {
        return FIXED_SERIALIZED_SIZE + (value == null ? 0 : value.serializedSize());
    }

    @Override
    public void serialize(IWALByteBufferView buffer) {
        buffer.put(type.getCode());
        buffer.putLong(memTableId);
        switch (type) {
            case INSERT_TABLET_NODE:
                ((InsertTabletNode) value)
                        .serializeToWAL(buffer, tabletInfo.tabletStart, tabletInfo.tabletEnd);
                break;
            case INSERT_ROW_NODE:
            case DELETE_DATA_NODE:
            case MEMORY_TABLE_SNAPSHOT:
                value.serializeToWAL(buffer);
                break;
            default:
                throw new RuntimeException("Unsupported wal entry type " + type);
        }
    }

    private static class TabletInfo {
        /**
         * start row of insert tablet
         */
        private final int tabletStart;
        /**
         * end row of insert tablet
         */
        private final int tabletEnd;

        public TabletInfo(int tabletStart, int tabletEnd) {
            this.tabletStart = tabletStart;
            this.tabletEnd = tabletEnd;
        }
    }

    @Override
    public boolean isSignal() {
        return false;
    }
}
